投稿時間:2022-07-10 16:18:47 RSSフィード2022-07-10 16:00 分まとめ(19件)

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python	Pythonタグが付けられた新着投稿 - Qiita	Pythonモジュールの一覧化方法いろいろ	https://qiita.com/ryoma-jp/items/9027b7cfd4effec0c86e	記事	2022-07-10 15:47:34
python	Pythonタグが付けられた新着投稿 - Qiita	pythonで決定木を作る最短解説	https://qiita.com/aokomoriuta/items/7173840fa0e0ed3b9cad	面倒	2022-07-10 15:14:54
python	Pythonタグが付けられた新着投稿 - Qiita	【requests】PythonでSocksProxyを使う備忘録	https://qiita.com/shuyaeer/items/95d375e5b15c50760414	requests	2022-07-10 15:08:58
python	Pythonタグが付けられた新着投稿 - Qiita	【Python】二次元平面上で原点を中心に回転移動した座標	https://qiita.com/shoku-pan/items/bf8ec0d3b2082d194671	abdmapintinputsplit	2022-07-10 15:04:51
AWS	AWSタグが付けられた新着投稿 - Qiita	【Sphinx / GitHubActions / CloudFront / S3】PythonコードをSphinxでドキュメント化してみる	https://qiita.com/taki_21/items/8eb5ded81980ddc71ede	githubactionscloudfronts	2022-07-10 15:53:36
AWS	AWSタグが付けられた新着投稿 - Qiita	もう迷わない！Figを使ってCLI＆シェルライフを快適にしよう！！	https://qiita.com/hedgehog051/items/b8bb12510490d1408fd5	awscli	2022-07-10 15:13:31
AWS	AWSタグが付けられた新着投稿 - Qiita	IAM Roles AnyWhere で オンプレサーバ → KinesisFirehose → S3にデータ転送	https://qiita.com/nakamura_trinet_co_jp/items/a2bea75212c10c20689a	centos	2022-07-10 15:08:18
Docker	dockerタグが付けられた新着投稿 - Qiita	docker compose up --build でexit code: 100	https://qiita.com/YukiYamamoto/items/57c61f17255651f343af	docker	2022-07-10 15:18:35
golang	Goタグが付けられた新着投稿 - Qiita	gorm & sqliteで時刻を上手に扱う方法	https://qiita.com/plyuzep/items/82bdeab73a55d91700a5	unixtime	2022-07-10 15:38:29
Ruby	Railsタグが付けられた新着投稿 - Qiita	railsでparams.require(モデル)を指定したときにparam is missing or the value is empty:エラーが発生する	https://qiita.com/Ta_Tos/items/968291da67f1504f3e44	params	2022-07-10 15:00:47
海外TECH	DEV Community	Detect object changes with JavaScript Proxy	https://dev.to/dailydevtips1/detect-object-changes-with-javascript-proxy-1o5g	Detect object changes with JavaScript ProxyLet s say we have an object for our users How can we detect when a property changes const user firstName Chris lastName Bongers age Now the user changes his age by using the following code user age However we want to log this change to keep track of specific changes Using JavaScript Proxy to detect object changesThat s again where the Proxy object comes in handy As we learned in the previous article the Proxy object comes with a set handler trap The set handler can pass us the following three parameters object The whole object we are trying to modifyproperty The property we are trying to modifyvalue The new value we are trying to setLet s create a proxy to our user object so we can attach a handler const handler set target prop value Our code const proxyUser new Proxy user handler As for the code we want to log which property is being changed what the previous value was and what the new value will be Then we need to ensure that we set the new value The result is the following function const handler set target prop value console log changed prop from target prop to value target prop value Let s try it out by modifying the age again proxyUser age Now the console will show this change and log changed age from to Detecting additional Object propertiesSometimes we might push new properties to the object Let s see how we can capture that proxyUser email info daily dev tips com And again this will neatly log the change changed email from undefined to info daily dev tips com However there is one small exception If we have a sub object or array in our main object it won t work out of the box const user firstName Chris lastName Bongers age address postalCode AB proxyUser address postalCode CD This now logs nothing new but the property is changed And that s because there is now a deep proxy set To log on that level we can again leverage the get handler and proxy each property to be a proxy itself const handler get target key if typeof target key object amp amp target key null return new Proxy target key handler return target key set target prop value console log changed prop from target prop to value target prop value And now when we rerun our code we see the log appear as changed postalCode from AB to CD I added these examples to CodePen so you can try them out yourself Thank you for reading and let s connect Thank you for reading my blog Feel free to subscribe to my email newsletter and connect on Facebook or Twitter	2022-07-10 06:49:20
海外TECH	DEV Community	11 Advanced React Interview Questions you should absolutely know (with detailed answers)	https://dev.to/ruppysuppy/11-advanced-react-interview-questions-you-should-absolutely-know-with-detailed-answers-1n05	Advanced React Interview Questions you should absolutely know with detailed answers What is the React Virtual DOM Virtual DOM is a concept where a virtual representation of the real DOM is kept inside the memory and is synced with the actual DOM by a library such as ReactDOM The virtual DOM is an object that represents the real DOM in the memory Since DOM updates are an integral part of any web app but are the costliest operation in the world of frontend the virtual DOM is utilized to check for parts of the app that need to be updated amp update only those parts thus significantly boosting performance Why do we need to transpile React code React code is written in JSX but no browser can execute JSX directly as they are built to read only regular JavaScript Thus we require to use tools like Babel to transpile JSX to JavaScript so that the browser can execute it What is the significance of keys in React Keys in React is used to identify unique VDOM Elements with their corresponding data driving the UI having them helps React optimize rendering by recycling existing DOM elements Key helps React identify which items have changed are added or are removed enabling it to reuse already existing DOM elements thus providing a performance boost For example const Todos todos gt return lt div gt todos map todo gt lt li gt todo text lt li gt lt div gt This would cause new DOM Elements to be created everytime todos change but adding the key prop lt li key todo id gt todo text lt li gt would result in dragging around the DOM Elements inside the ul tag amp updating only the necessary lis What is the significance of refs in React Refs are variables that allow you to persist data between renders just like state variables but unlike state variables updating refs does NOT cause the component to re render Refs are usually used to but not restricted to store reference to DOM elements What are the most common approaches for styling a React application CSS ClassesReact allows class names to be specified for a component like class names are set for a DOM element in HTML When developers first start using React after developing traditional web applications they often opt for CSS classes as they are already familiar with the approach Inline CSSStyling React elements using inline CSS allows styles to be completely scoped to an element However certain styling features are not available with inline styles For example the styling of pseudo classes like hover Pre processors Sass Stylus and Less Pre processors are often used on React projects This is because like CSS they are well understood by developers and are often already in use if React is being integrated into a legacy application CSS in JS Modules Styled Components Emotion and Styled jsx CSS in JS modules are a popular option for styling React applications because they integrate closely with React components For example they allow styles to change based on React props at runtime Also by default most of these systems scope all styles to the respective component being styled What are some of the performance optimization strategies for React Using useMemouseMemo is a React hook that is used for caching CPU Expensive functions A CPU Expensive function called repeatedly due to re renders of a component can lead to slow rendering useMemo hook can be used to cache such functions By using useMemo the CPU Expensive function gets called only when it is needed useCallback can be used to obtain a similar result Lazy LoadingLazy loading is a technique used to reduce the load time of a React app It helps reduce the risk of web app performances to a minimum by loading up the components as the user navigates through the app What is prop drilling and how to avoid it Sometimes while developing React applications there is a need to pass data from a component that is higher in the hierarchy to a component that is deeply nested To pass data between such components we pass props from a source component and keep passing the prop to the next component in the hierarchy till we reach the deeply nested component The disadvantage of using prop drilling is that the components that should otherwise be not aware of the data have access to the data moreover the code becomes harder to maintain Prop drilling can be avoided using the Context API or some form of State Management library What is the StrictMode component and why would you use it lt StrictMode gt is a component included with React to provide additional visibility of potential issues in components Suppose the application is running in development mode In that case any issues are logged to the development console but these warnings are not shown if the application is running in production mode Developers use lt StrictMode gt to find problems such as deprecated lifecycle methods and legacy patterns to ensure that all React components follow current best practices lt StrictMode gt can be applied at any level of an application component hierarchy which allows it to be adopted incrementally within a codebase What are synthetic events in React Synthetic events combine the response of different browser s native events into one API ensuring that the events are consistent across different browsers The application is consistent regardless of the browser it is running in const Component gt const handleClick e gt e preventDefault synthetic event console log link clicked return lt a onClick e gt handleClick gt Click me lt a gt Why is it not advisable to update state directly but use the setState call The conventional way to update state is to use the setState call Without using it the user would still be able to modify the state but it would not update the DOM to reflect the new state const Component gt const count setCount useState let count setCount React useState const handleClickUpdate gt setCount c gt c count count will not update the DOM return lt gt count lt button onClick handleClickUpdate gt Click me lt button gt lt gt What are portals in React Portal is a recommended way to render children into a DOM node that exists outside the DOM hierarchy of the parent component const Portal children gt NOTE it is advisable to create a new DOM node for the portal const portalRoot document getElementById portal root return ReactDOM createPortal children portalRoot Research says writing down your goals on pen amp paper makes you to more likely to achieve them Check out these notebooks and journals to make the journey of achieving your dreams easier Thanks for readingNeed a Top Rated Front End Development Freelancer to chop away your development woes Contact me on UpworkWant to see what I am working on Check out my Personal Website and GitHubWant to connect Reach out to me on LinkedInFollow me on Instagram to check out what I am up to recently Follow my blogs for Weekly new Tidbits on DevFAQThese are a few commonly asked questions I get So I hope this FAQ section solves your issues I am a beginner how should I learn Front End Web Dev Look into the following articles Front End Development RoadmapFront End Project IdeasWould you mentor me Sorry I am already under a lot of workload and would not have the time to mentor anyone	2022-07-10 06:22:06
ニュース	BBC News - Home	Sri Lanka: President Rajapaksa to resign after palace stormed	https://www.bbc.co.uk/news/world-asia-62108597?at_medium=RSS&at_campaign=KARANGA	crisis	2022-07-10 06:44:49
サブカルネタ	ラーブロ	再訪３　メンショップ アキラ　すったてつけ麺(980円)	http://ra-blog.net/modules/rssc/single_feed.php?fid=200814	埼玉県川越市砂	2022-07-10 07:28:59
北海道	北海道新聞	北海道内８５９人感染　９日連続前週上回る　新型コロナ	https://www.hokkaido-np.co.jp/article/703945/	北海道内	2022-07-10 15:27:00
北海道	北海道新聞	道南在住６４人感染　新型コロナ	https://www.hokkaido-np.co.jp/article/703944/	道南	2022-07-10 15:19:42
北海道	北海道新聞	「ＳＯに厚みできたのは収穫」　ラグビー代表戦総括	https://www.hokkaido-np.co.jp/article/703942/	藤井	2022-07-10 15:12:00
北海道	北海道新聞	後志管内１６人感染　新型コロナ	https://www.hokkaido-np.co.jp/article/703941/	新型コロナウイルス	2022-07-10 15:09:00
IT	週刊アスキー	ヒカル考案“冗談抜きで旨い”「牛焼肉定食」ジョイフルで！ ヒットのコラボシリーズ第4弾	https://weekly.ascii.jp/elem/000/004/097/4097425/	焼肉定食	2022-07-10 15:30:00